Add hpa behavior helm chart

operations/helm/charts/grafana-agent/CHANGELOG.md

@@ -10,6 +10,10 @@ internal API changes are not present.
 Unreleased
 ----------
 
+### Features
+
+- Add HPA behavior support for scaling up and down. (@wildum)
+
 0.31.1 (2024-01-19)
 -------------------
 

operations/helm/charts/grafana-agent/README.md

@@ -75,6 +75,12 @@ use the older mode (called "static mode"), set the `agent.mode` value to
 | controller.autoscaling.minReplicas | int | `1` | The lower limit for the number of replicas to which the autoscaler can scale down. |
 | controller.autoscaling.targetCPUUtilizationPercentage | int | `0` | Average CPU utilization across all relevant pods, a percentage of the requested value of the resource for the pods. Setting `targetCPUUtilizationPercentage` to 0 will disable CPU scaling. |
 | controller.autoscaling.targetMemoryUtilizationPercentage | int | `80` | Average Memory utilization across all relevant pods, a percentage of the requested value of the resource for the pods. Setting `targetMemoryUtilizationPercentage` to 0 will disable Memory scaling. |
+| controller.autoscaling.scaleDown.policies | list | `[]` | List of policies to determine the scale-down behavior. |
+| controller.autoscaling.scaleDown.selectPolicy | string | `Max` | Determines which of the provided scaling-down policies to apply if multiple are specified. |
+| controller.autoscaling.scaleDown.stabilizationWindowSeconds | int | `300` | The duration that the autoscaling mechanism should look back on to make decisions about scaling down. |
+| controller.autoscaling.scaleUp.policies | list | `[]` | List of policies to determine the scale-up behavior. |
+| controller.autoscaling.scaleUp.selectPolicy | string | `Max` | Determines which of the provided scaling-up policies to apply if multiple are specified. |
+| controller.autoscaling.scaleUp.stabilizationWindowSeconds | int | `0` | The duration that the autoscaling mechanism should look back on to make decisions about scaling up. |
 | controller.dnsPolicy | string | `"ClusterFirst"` | Configures the DNS policy for the pod. https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/#pod-s-dns-policy |
 | controller.enableStatefulSetAutoDeletePVC | bool | `false` | Whether to enable automatic deletion of stale PVCs due to a scale down operation, when controller.type is 'statefulset'. |
 | controller.extraAnnotations | object | `{}` | Annotations to add to controller. |

operations/helm/charts/grafana-agent/templates/hpa.yaml

@@ -25,6 +25,29 @@ spec:
   {{- with .Values.controller.autoscaling }}
   minReplicas: {{ .minReplicas }}
   maxReplicas: {{ .maxReplicas }}
+  behavior:
+    {{- with .scaleDown }}
+    scaleDown:
+      policies:
+      {{- range $policy := .policies }}
+      - type: {{ $policy.type }}
+        value: {{ $policy.value }}
+        periodSeconds: {{ $policy.periodSeconds }}
+      {{- end }}
+      selectPolicy: {{ .selectPolicy }}
+      stabilizationWindowSeconds: {{ .stabilizationWindowSeconds }}
+    {{- end }}  # This ends the scaleDown block
+    {{- with .scaleUp }}
+    scaleUp:
+      policies:
+      {{- range $policy := .policies }}
+      - type: {{ $policy.type }}
+        value: {{ $policy.value }}
+        periodSeconds: {{ $policy.periodSeconds }}
+      {{- end }}
+      selectPolicy: {{ .selectPolicy }}
+      stabilizationWindowSeconds: {{ .stabilizationWindowSeconds }}
+    {{- end }} 
   metrics:
     # Changing the order of the metrics will cause ArgoCD to go into a sync loop
     # memory needs to be first.

operations/helm/charts/grafana-agent/values.yaml

@@ -206,6 +206,28 @@ controller:
     # -- Average Memory utilization across all relevant pods, a percentage of the requested value of the resource for the pods. Setting `targetMemoryUtilizationPercentage` to 0 will disable Memory scaling.
     targetMemoryUtilizationPercentage: 80
 
+    scaleDown:
+      # -- List of policies to determine the scale-down behavior.
+      policies: []
+        # - type: Pods
+        #   value: 4
+        #   periodSeconds: 60
+      # -- Determines which of the provided scaling-down policies to apply if multiple are specified.
+      selectPolicy: Max
+      # -- The duration that the autoscaling mechanism should look back on to make decisions about scaling down.
+      stabilizationWindowSeconds: 300
+
+    scaleUp:
+      # -- List of policies to determine the scale-up behavior.
+      policies: []
+        # - type: Pods
+        #   value: 4
+        #   periodSeconds: 60
+      # -- Determines which of the provided scaling-up policies to apply if multiple are specified.
+      selectPolicy: Max
+      # -- The duration that the autoscaling mechanism should look back on to make decisions about scaling up.
+      stabilizationWindowSeconds: 0
+
   # -- Affinity configuration for pods.
   affinity: {}